Important: If you use Google Apps — that is, if you have an email address of the form username@your-domain.com provided to you by an organization you belong to — your domain administrator can purchase additional storage on your behalf. The administrator also has the option to prevent you from purchasing additional storage space by disabling the User Managed Storage service.

See Buy storage when you're ready to purchase more storage space. Keep in mind:

The extra storage is only available to you. You can't share it with other users or transfer it to another account. You can't purchase storage for other users.

Data in the extra storage is subject to the same ownership policy as the rest of your account. Google does not own your data. When your organization gave you a Google Apps account, it did so with a particular agreement about whether the data in your account belongs to the organization or to you. (Each organization's policy is different.) Whatever policy is in place for your account applies equally to data in the extra storage.

The administrator for your organization has the option to prevent you from purchasing or renewing extra storage, or to prevent you from using Google Drive, Gmail, or Google+ Photos. These actions could prevent you from taking full advantage of the extra storage. Google storage purchases are non-refundable even under these circumstances. You can purchase additional storage only when your administrator enables the User Managed Storage service for the organization you belong to.

After your storage expires or you cancel the subscription, your storage limits are set back to the standard levels. All of your existing data, such as photos, mail, and uploaded files, remain accessible, but you won't be able to add anything new for any product over the storage limit.